Van Allen on Space Radiation.

[Luke Pemberton]

Ok if this is the H-alpha data, where in the data would I find the shock driven CM's?

You don't, there's nothing in the data to point to SPE events as the data does not describe proton data, it describes the prominence of the H-alpha line and radio wave characteristics during a solar flare (a localised event). Entrance stage left - Jay and the great IMDb debate.

There is research that correlates the significance of H-alpha with an SPE, and shows that a greater H-alpha prominence means a higher probability of an SPE.  However, an SPE is no indicative of a shock driven halo-CME. SPE is simply a definition that relates to a higher proton flux. In other words, not all SPEs are halo-CMEs. In fact some SPEs are quite minor, and simply weather.

[Luke Pemberton]

It's hard to fathom the energies involved here, especially when you consider that the "surface" gravity on the sun is 28 g!

Which I always think is quite small for something that size. Why do numbers in physics just never seem to add up to expectations?

[bknight]

Ok if this is the H-alpha data, where in the data would I find the shock driven CM's?

You don't, there's nothing in the data to point to SPE events as the data does not describe proton data, it describes the prominence of the H-alpha line and radio wave characteristics during a solar flare (a localised event). Entrance stage left - Jay and the great IMDb debate.

There is research that correlates the significance of H-alpha with an SPE, and shows that a greater H-alpha prominence means a higher probability of an SPE.  However, an SPE is no indicative of a shock driven halo-CME. SPE is simply a definition that relates to a higher proton flux. In other words, not all SPEs are halo-CMEs. In fact some SPEs are quite minor, and simply weather.

OK, I re-read the whole tread after posting, and you indicated that no space pre 1976 data was recorded, so the Aug 1972 event was measured here on Earth somewhere.  I think the last two sentences sum up an answer to my initial intent.

[raven]

It's hard to fathom the energies involved here, especially when you consider that the "surface" gravity on the sun is 28 g!

Which I always think is quite small for something that size. Why do numbers in physics just never seem to add up to expectations?

Well, it's size or, rather, density, has something to do with it. Saturn's "surface" gravity is only 0.633 m/s² more than Earth's despite having 95 times the mass.

[Luke Pemberton]

It's hard to fathom the energies involved here, especially when you consider that the "surface" gravity on the sun is 28 g!

Which I always think is quite small for something that size. Why do numbers in physics just never seem to add up to expectations?

Well, it's size or, rather, density, has something to do with it. Saturn's "surface" gravity is only 0.633 m/s² more than Earth's despite having 95 times the mass.

I understand how to calculate g . It's the dependence of g with mass and radius. Physics is sometimes counterintuitive, Saturn is another good example.

[Glom]

Saturn will also float in the sea.

[bknight]

Saturn will also float in the sea.

Very big and deep sea!

[Luke Pemberton]

Saturn will also float in the sea.

Great fact.

[nomuse]

Don't use the bathtub, tho ....it will leave a ring.

[bknight]

Don't use the bathtub, tho ....it will leave a ring.

Very cute.

[raven]

The real question is, what would Uranus leave?

[BazBear]

Saturn will also float in the sea.

Very big and deep sea!

A sea that big would have so much gravity that Saturn would be doooooomed!

[Count Zero]

You could do it on Ringworld. 

[ka9q]

The interesting thing about planetary gravities in the solar system is how there are only two discrete values, plus Jupiter as an outlier.

Venus, Earth, Saturn, Uranus and Neptune are all about 1g, +/- 15% or so. Mars and Mercury are around 1/3 g. Jupiter is the outlier at 2.5g.

[nomuse]

Erm, yeah, but how arbitrary is that "surface" definition for the gas giants? Do any of them have a distinct edge  or is it more the zone where the average of material in one particular phase is larger (by mass? by volume?) than the other?